A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Longitudinal Bar Spacing and Intermediate Ties
The current ACI 318 provision for minimum lateral support of longitudinal column bars originated with the publication of the 1963 Code. The provision was apparently based on experience and thereafter deemed by the Code writers as good engineering practice. However, there apparently has never been any testing done specifically to determine if the 6 in. maximum lateral support requirement of ACI 318-14, Sections 9.7.6.4.4, 23.6.3.3, and 25.7.2.3, is necessary. To date, researchers have not agreed whether ties are provided for concrete confinement or prevention of longitudinal bar buckling in concrete columns. Therefore, a larger maximum allowable spacing for lateral support may be realizable through analytical and experimental research. Full-scale experimental testing should be conducted to evaluate the lateral support spacing requirement in ACI 318-14, Sections 9.7.6.4.4, 23.6.3.3, and 25.7.2.3. If the research shows that unsupported longitudinal column bars can be farther than 6 in. from bars supported by crossties or a corner of a tie, significant cost savings in material and labor may be realized.
Longitudinal Bar Spacing and Intermediate Ties
The current ACI 318 provision for minimum lateral support of longitudinal column bars originated with the publication of the 1963 Code. The provision was apparently based on experience and thereafter deemed by the Code writers as good engineering practice. However, there apparently has never been any testing done specifically to determine if the 6 in. maximum lateral support requirement of ACI 318-14, Sections 9.7.6.4.4, 23.6.3.3, and 25.7.2.3, is necessary. To date, researchers have not agreed whether ties are provided for concrete confinement or prevention of longitudinal bar buckling in concrete columns. Therefore, a larger maximum allowable spacing for lateral support may be realizable through analytical and experimental research. Full-scale experimental testing should be conducted to evaluate the lateral support spacing requirement in ACI 318-14, Sections 9.7.6.4.4, 23.6.3.3, and 25.7.2.3. If the research shows that unsupported longitudinal column bars can be farther than 6 in. from bars supported by crossties or a corner of a tie, significant cost savings in material and labor may be realized.
Longitudinal Bar Spacing and Intermediate Ties
Ben DeGagné (author) / Ece Erdogmus / John Savage
2016
Article (Journal)
English
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